Portable door-lock.



PATENTED JAN. 20, 1903.

A. W. SWANBURG. PORTABLE DOOR LOOK.

APPLICATION FILED SEPT. 29, 1902.

H0 MODEL.

Will M311 Wbhessem vvv I VVV Vw UNITED STATES PATENT OFFICE.

ARTHUR W. SWANB'URG, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF TWO- TH'IRDS TO NELS F. OLSON AND ALEX LARSON, OF MINNEAPOLIS, MIN- NESOTA.

PORTABLE DOOR-LOCK.

SPECIFICATION formingpart of Letters Patent No. 718,673, dated January 20, 1903. Application filed September 29,1902- Serial No. 125,151. (No model.)

To all whom it may concern.-

Be it known that I, ARTHUR W. SWANBURG, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in Portable Door- Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled [O in the art to which it appertains to make and use the same.

My invention has for its object to provide a convenient and reliable portable door-lock.

To this end my invention consists of the device hereinafter described, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like characters refer to like parts throughout the several views.

In said drawings, Figure 1 is a view in elevation showing a door with my lock applied thereto in working position. Fig. 2 isa view in section on the line 00 m of Fig. 1.

In the casing 1 is mounted the door 2 in the usual way, above the threshold 3.

My lock comprises a body 4, which is provided with three angular projections marked, respectively, a, b, and c. The device is preferably made of metal and is either cast or go stamped to secure the desired form. The projection a is adapted to engage with the under edge of the door, the projection b is adapted to engage with the floor, and the projection e is adapted to engage with the face of the I door at a short distance above the lower edge of the same. The projections a and b are so disposed in respect to each other that if the device be in working position, as shown in Figs. 1 and 2, and anyattempt be made to open the door this will only serve to wedge the door tighter to the lock and increase the bite of the lock on the floor. Thiswould be true to a considerable degree even if the third projection 6 were not employed. With the ad- 5' dition of the third projection 6, however, en-

gaging with the face of the door, as described, an important additional function is secured, to wit: Any attempt to open the door not only secures the wedging action between the door, the lock, and the fioor, as above described, but also tends to rock the lock on the point or projection 1), thereby lifting the door and tightly clamping the upper end of the same against the lintel or cap-plate of the casing. Hence with the use of the three projections a, b, and e the strength of the locking action is greatly increased.

The device is of course very simple and cheap to. make, and is of such small size and so light in Weight that it may be readily carried aboutin the pocket. This lock is therefore especially well adapted for use by traveling salesmen and others whose business calls upon them frequently to occupy rooms where the doors are either without any locks at all or where locks of unreliable character are so often found.

As shown, the body of the device is provided with an angular projection d, which serves as a convenient handle for the manipulation of the device and affords a good shoulder for the application of the foot to force the lock securely into its locking position. The device, as shown, is also provided with a projection c, which serves as a reinforcing-brad for cooperation with the projection or brad b to engage the floor ,if the device be rocked beyond a predetermined limit in the opening action of the door. The brad 0, however, may be dispensed with without materially interfering with the success of the device.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. A portable door-lock comprising the body 4 provided with the angular projections a, b and e, engageable respectively with the under edge of the door, with'the fioor, and with the face of the door, the said projections being so disposed, with respect to each other, that any attempt to open the door will pro- 0 duce a wedging action on the door and inl forcing the action of the projection 19, and 10 crease the bite of the device on the floor, subsaid projection dserving as a foot-rest for stantially as described. forcing the device to working position.

2. Aportable door-lock comprising the body In testimony whereof I afiix my signature 4, having the angular projections a, b, c, d in presence of two witnesses.

and e, said projections a, b and 6 being nor- ARTHUR W. SWANBURG. mally engage-able, respectively, under the WVitnesses: 1 edge of the door, with the floor, and with the ELIZABETH I-I. KELIHER,

face of the door, the said projection c rein- F. D. MERCHANT. 

